EE321 Spring 08 HW8
Problem 33
Buck Converter Operation
Consider a machine with the following parameters:
r
a
0.1
:=
k
v
0.2
:=
The machine is fed using a buck converter with the following parameters
v
fsw
2.4
:=
v
fd
2.0
:=
v
dc
150
:=
d
0.7
:=
The machine is operating at a speed of 300 rad/s.
Compute the armature current, the average switch
current, the motor efficiency, the converter efficiency, and teh overall efficiency
First lets find the operating point
ω
r
450
:=
v
a
v
dc
v
fsw
−
(
)
d
⋅
1
d
−
(
)
v
fd
−
(
)
⋅
+
:=
v
a
102.72
=
i
a
v
a
k
v
ω
r
⋅
−
r
a
:=
i
a
127.2
=
Aveage armature current
i
s
d
i
a
⋅
:=
i
s
89.04
=
Average switch Current

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